What is the Descriptive Statistics Flashcards

A descriptive measure of a sample

Method of organizing, summarizing, and presenting data

The group of all items of interest

The process of making an estimate. prediction, or decision about a population based on sample data

A set of data drawn from a population

The data can be arranged in order & differences b/w data values are meaningful

The data consists of names, labels, or categories. There are no criteria for ordering the data from smallest to largest

The data can be arranged in order & both & ratios b/w data values are meaningful. Also data has a true, absolute zero.

The data can be arranged in order. However, differences b/w data values either can;t be determined or are meaningless

The Requirements of a Random Sample

Divide the entire population into pre-existing segments or clusters. The clusters are often geographic. Make a random selection of clusters. Include every member of each selected cluster in the sample.

Create a sample by using data from population members that are readily available.

A simple random sample of n measurements from a population is a subset of the population selected in a manner such that every sample of size n from the population has an equal chance of being selected.

Divide the entire population into distinct subgroups called strata. The strata are based on a specific characteristic such as age, income, education level, and so on. All members of a stratum share the specific characteristic. Draw random samples from each stratum.

Number all members of the population sequentially. Then, from a starting point selected at random, include every kth member of the population in the sample.